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Desheng 1012 12-band television sound radio circuit diagram
Desheng 1012 12-band FM, MW, SW, TV sound radio circuit diagram as follows:
TV Pattern Generator (ZNA234E)
This Circuit uses the ZNA234E IC which makes available all the waveforms necessary to produce the crosshatch, dot and greyscale test patterns on a television screen. The composite video output can be injected directly into the video input of a receiver or used to drive a modulator for connection to the aerial socket.
The amplifier picks up the TV"s audio output signal and amplifies it to drive a set of earphones for private listening. It is built around an LM324 quad op amp and an LM386 low-power audio amplifier.
This circuit provides a simple, low-cost crosshatch generator tor convergence and geometry adJUStments on color TVs. The generator is driven by two clocks, one for the horizontal drive, IC1ab, and one for the vertical drive, IC2ab. The clock outputs are applied to the two binary counters contained in IC5 which generate the line and field sync...
Stereo tv decoder
The composite input signal is preamplified by transistor Ql and is then coupled to the high-pass filter composed of C3, C4, R6, and R7. The filtered audio is then passed to IC1, an MC1310P "Coilless Stereo Demodulator." That IC is normally used to demodulate broadcast-band FM signals, but by changing the frequency of its on-board VCO (Voltage...
PAL Colour Encoder (TEA2000-V1)
A PAL color encoder and video summer which requires just composite sync and composite blanking inputs, and a 6-bit binary coded input giving the color information. The inputs are organized as 2 bits per primary color with gamma correction automatically applied to the resultant luminance and chrominance levels.
A pattern generator is a very useful instrument for the correct alignment of the timing circuits of a television set. The circuit we propose you to build, is a «bar generator» that will produce horizontal and vertical stripes (bars) on the TV screen, that will help you align the vertical and horizontal scanning synchronisation circuits of the...
Video Line Selector
When measure video signal with oscilloscope, video line selector is very useful to find a scan line. The line selecter generates trigger pulse at selected line, oscilloscope will display only selected line. This is a very simple video line selector.
Video amplifier provides digital gain control
The amplifier in Figure 1 originally served as the photomultiplier preamplifier in a Doppler system intended for eventual operation in the Martian atmosphere. The design is based on a switchable array of six Maxim MAX4258 dual-channel video multiplexer-amplifiers, IC1 through IC6. Under control of a 4-bit input word, you can set the number of...
YUV(YCbCr) to RGB converter
Recently, most digital video equipments, such as video recorder, DVD player and TV game, have component video output. The component video signal is like RGB video signal, but it cannot connect to RGB monitor directly. Thus I designed and built YUV(YCrCb) to RGB converter to use old TV monitor or video equipment which does not have component...
4x4 Video Crosspoint Has 100MHz Bandwidth 85dB
The compact high performance 4 x 4 crosspoint shown in Figure 1 uses four LT1205s to route any input to any or all outputs. The complete crosspoint uses only six SO packages, and less than six square inches of PC board space. The LT1254 quad current feedback amplifier serves as a cable driver with a gain of 2.
Crosspoint switchesl for video-security systems
Crosspoint switches are ideal for use in video-security systems, which accept multiple camera inputs while providing playback and multiple loop-through to multiple monitors. To provide video loop-through or monitor outputs, these systems often require additional multiplexer amplifiers that can drive standard video loads.
An Adjustable Video Cable Equalizer
This design note presents a voltage controlled cable equalizer based on the LT1256 video fader. The circuit features ease of adjustment, simplicity and the capability for remote control. The amount of equalization can be adjusted continuously from the maximum allowed by the passive components to none at all.
PAL colour bar generator
The first idea they was to work with 8.867238 MHz crystal (2 times the color carrier). When I read more about PAL video composite signal creation, I saw that, if you want to product colors entire-in-software you must to create the color-carrier (4.43 MHz), to change 4 times the phase of color-carrier (one time for each color), to show 4 colours....
Circuit facilitates video fading
When you`re copying videotapes, it`s sometimes desirable to suppress some passages. Using the pause control of the recorder does not yield satisfactory results. Another method produces better results (Figure 1). The video source connects to the video-in plug, and the recorder connects to the video-out plug.
Circuit yields ultralow-noise VGA
A number of single-chip VGAs variable-gain amplifiers are available today. Unfortunately, they all have drawbacks, such as high noise, 55V limit, low input impedance, or nonlinear gain/frequency characteristics. The circuit in Figure 1 is a 16-step, ultralow-noise VGA that solves many of these problems.
Connection of the TV set to vga/svga to a card
The difficulty of connection vga of a videocard to the TV set is, that Frequency of lower case development(display) of the TV set makes 15 KHz, and VGA card - from 31 KHz and is higher. Translation of development(display) of the TV set up to 31 KHz practically is unreal, because of the large inductance coil and excessive parasitic capacity SPLIT.
Filter design uses image parameters
The technique applies to highpass filters. You derive a composite highpass filter by using m-derived terminating half-sections with one or more constant-k interior full sections. Classic image-parameter design used m-derived half-sections with m=0.6 for best passband impedance matching (in other words, high input and output return losses).
Homebuilt digital video TBC/standards converter
A crucial point in the design is the input/decoder section, and the question of what ICs to use for decoding the input video to component digital video streams. The choice for this project was the Philips IC SAA7114H, new on the market at the time. This chip is basically an A/D converter that produces a digital data stream from an analog video...
The KD2BD ATV AM Video Modulator
A 2N3904 in the base circuit sets the `Q' point of the amplifier. FM subcarrier audio at 4.5 MHz is also injected at this point through a 3300 ohm resistor and a DC blocking capacitor. A high frequency 5-watt RF power transistor (2SC1909) serves as the last stage of the modulator. An NTE-235, NTE-236, or equivalent is suitable in this...
Miniature Black and White TV System
The 12VDC supply provides power for the camera and video modulator circuits. The video from the camera is fed into the video input of the modulator circuit. The modulated RF from the modulator is fed into a small antenna. Use of a dipole antenna that is resonant at the frequency of the modulator can extend the signal range. The RF travels across...
Video Signal Distribution Using Low Supply Voltage Amplifiers
Video designs are often pressed to operate on the lowest possible rail voltagesa simple result of the trend towards lower voltage logic and the advantages of sharing supply potentials wherever possible.
VID2G project is an PAL/NTSC color generator & video identifier with digital sync regeneration, digital PLL, video Squelch output, predefined video pages, keyboard & full RS-232 access, etc. Dynamic and fixed ID`s, user positions, user selectable start page, Text script files for user created pictures (samples included in ZIP), and more.
Simple video fader
This is a very basic circuit for fading video signal shown in Eletor Electronics magazine. You can use this between two video equipments. The circuit is so simple that the impedance matching and some other things are not exactly correct, so might not always wor reliably. Anyway it is so simple and easy to build that it does not hurt much to try.
Video emitter uses battery power
The block diagram in Figure 1 shows how to make a cable-free, direct-video system. The system allows users to walk from booth to booth at an exhibition to interview people and to display the interviews in real time on three screens at key locations.
RGB To Monochrome converter
Often you can get away with running a monochrome monitor on GREEN, but this looks real crappy when viewing color images. These simple resistor networks allow you to display R+G+B on a B/W or CCTV monitor without ghosting. Be shure to set your video card for 60Hz interlaced.
Test signals inserted in the lines of the vertical blanking interval, defined by the TV standard, e. g. for the 625 standard the CCIR together with the EBU issued the formal specifications for the signals inserted in lines 17, 18, 330 and 331.
TV RGB signal output from a SVGA graphics card
The idea to produce a standard TV PAL signal using a SVGA graphics card was born a few years ago, where cheap graphics cards with TV output were still not available. To achieve a CCIR conform TV signal with 50 Hz vertical interlaced refresh and 15.625 kHz horizontal frequency on most SVGA cards its possible to re-program CRT timing and generate...
VGA Hardware Screen Blanker
This design was published in the June 1994 issue of Electronics Australia, and has proven extremely popular. The kit was sold by Jaycar Electronics, but has since been discontinued. It is a simple device that connects between your keyboard and VGA card feature connector, and will blank (or blink) the screen after a certain amount of non-keyboard...
Synchronous oscillator converts audio, video to FM
The synchronous oscillator (SO) and the coherent phase-locked synchronous oscillator (CPSO) are universal multifunctional networks that track, synchronize, and amplify as much as 80 dB; improve SNR by as much as 70 dB; and modulate AM, FM, and FSK signals.
Video amplifier 1
No Description available.
Video amplifier 
No Description available.
Video Mixer Circuits
Video Wall Circuits
TV Video Circuits
Video Modulator Circuits
Photo Flash Circuits
Video Amplifier Circuits
Recording circuit of phone conversations using PC
This circuit is used to record telephone conversations on your landline telephone. All you will need is this small circuit and subscription of your PC. There are few times when we forget what we said or told us. So we need recording. Sometime, not many years ago, recording of this kind of conversation was done with a small tape recorder. The...
FM Micro-Transmitter Bug Surveillance Circuit
The transmitter we recommend to build is quite simple. It can even be built by a beginner. However, unlike the ease of construction and its small size, it is almost certain that it will impress you with its outstanding performance. Its autonomy is 12-15 hours, with a 9 volt battery and its range is from 100 to 300 meters depending on the...
Construction of 50Watt 8Ω two-way Hi-Fi Speakers
The presented speakers are distinguished for their small dimensions and their extraordinary sound. Our home space is often limited and prohibitive for large speakers. This limitation does not mean that we will stay without high Sound Quality. Its design is simple, low cost and is easy to construct. Speaker types are too many and are designed in...
GSM modem circuit with Wavecom WMOi3
Modems are devices that connect either remote devices to a computer, or two or more computers to each other. Their connection is usually wired. The GSM modem we present is wireless. It can connect two computers, a computer with the internet or even be the central unit for a data acquisition system. Generally the construction is a GSM phone...
1W UHF Linear Amplifier with BLW33
This circuit is an amplifier for small transmitters operating in the UHF band, specifically in the 450-800MHz range. The amplifier works in class A and we used the well-known Philips BLW33 transistor for its manufacture. The construction, although simple, can be said to be quite critical due to the high frequency singularity. To achieve this, a...
8W Amplifier with TDA2003 circuit
Many times a small amplifier is needed to meet the needs of small spaces. This amplifier can be either mono or stereo, with this circuitry you can comfortably drive two small speakers. To build the amplifier you do not need anything but a few materials and a small power supply. The power of the amplifier, although low power, will solve many...
FM Linear Amplifier 400mW
This amplifier is intended for amplifying low signals from oscillators in the FM band. It does not have frequency regulators with variable capacitors and coils, it has a wide range and moderate power capable of driving several linear amplifiers. The whole construction is based on the two low-power 2N4427 transistors, which are designed for the...
50 Watt Hi-Fi power amplifier circuit
SGS Thomson's integrated TDA7294 is a high-frequency acoustic power amplifier, with true high-precision specifications, suited for all relevant applications. Its main feature is much higher output power than is usual in amplifiers with similar distortion performance. According to its manufacturer, the output stage of this 15-pin integrated can...
RF Remote Control Switch Rx-Tx circuits
This circuit consists of a 2048 radio remote control transmitter and the corresponding wireless receiver with very high reception sensitivity and low consumption. The combination of the two above gives a high-reliability remote control, ideal for security systems, alarms, automation, etc. At home, in the car and elsewhere. Using the wireless...
Digital Signal Integrity
Interconnection and Timing of Digital Circuits
CMOS Circuits Tutorial
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